Powertrain
generic / SAE
P0407
EGR Sensor B Circuit Low
The signal from EGR position or pressure sensor B is below the lower diagnostic threshold. Indicates a short to ground, open signal wire or sensor fault.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 07
Possible causes
- EGR sensor B internally faulty high
- Signal wire shorted to ground medium
- Connector corroded low
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–500 €
- Estimated time: 0.5–2 h
- Component: egr position sensor
- Component: egr pressure sensor
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012